Across
- 1. can be seen
- 2. can be heard
- 3. maximum position of wave
- 8. do not require a medium for them to move.
- 9. hertz
Down
- 1. cause the medium to move parallel to the direction of the wave.
- 4. a material that moves energy or light from one substance to another
- 5. space in which there is no matter
- 6. cause the medium to move perpendicular to the direction of the wave.
- 7. require a medium to propagate.